Photos of icy roadways released by Greenville County schools show why the schools are closed again today after Wednesday's snow.

The photos show different parts of the county and not necessarily the worst roads, said district spokeswoman Beth Brotherton.

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Icy conditions(Photo: Greenville County Schools)

"When our transportation department 'mapped' out the roads that were called in as a 'no go,' they were spread throughout the county," she said. "Icy roads would have cancelled hundreds of bus routes to dozens of schools in all parts of the county."

Problem areas were reported from the northern area near Blue Ridge High to the southern region near Sue Cleveland Elementary, she said.

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JL Mann High(Photo: Greenville County Schools)

"On the advice of our ICE team, who spent the day driving hundreds of roads in all parts of the county, we have determined there are too many roadways that are still unsafe for travel," Brotherton said.

She said that overnight temperatures were expected to drop into the 20s, and that the National Weather Service had issued a black ice advisory for this morning.

"Even a two hour delay would require bus drivers (600 people) and thousands of other employees to leave their home between 5 a.m. and 6 a.m. and travel to work in the dark," she said. "This weather system is not just a problem for the northern part of the county, our teams found issues at dozens of schools south of Interstate 85 and along hundreds of bus routes. One bad road can affect five to 10 bus routes."